diff --git a/tests/typescript_as/__snapshots__/jsfmt.spec.js.snap b/tests/typescript_as/__snapshots__/jsfmt.spec.js.snap
index a90a79d45674..073735fef7bc 100644
--- a/tests/typescript_as/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/typescript_as/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`as.js 1`] = `
+exports[`as.ts 1`] = `
 ====================================options=====================================
 parsers: ["typescript"]
 printWidth: 80
@@ -9,9 +9,12 @@ printWidth: 80
 const name = (description as DescriptionObject).name || (description as string);
 this.isTabActionBar((e.target || e.srcElement) as HTMLElement);
 (originalError ? wrappedError(errMsg, originalError) : Error(errMsg)) as InjectionError;
-'current' in (props.pagination as Object)
-start + (yearSelectTotal as number)
-scrollTop > (visibilityHeight as number)
+'current' in (props.pagination as Object);
+('current' in props.pagination) as Object;
+start + (yearSelectTotal as number);
+(start + yearSelectTotal) as number;
+scrollTop > (visibilityHeight as number);
+(scrollTop > visibilityHeight) as number;
 export default class Column<T> extends (RcTable.Column as React.ComponentClass<ColumnProps<T>,ColumnProps<T>,ColumnProps<T>,ColumnProps<T>>) {}
 export const MobxTypedForm = class extends (Form as { new (): any }) {}
 export abstract class MobxTypedForm1 extends (Form as { new (): any }) {}
@@ -35,6 +38,14 @@ const state = JSON.stringify({
 (bValue as boolean) ? 0 : -1;
 <boolean>bValue ? 0 : -1;
 
+const value1 = thisIsAReallyReallyReallyReallyReallyLongIdentifier as SomeInterface;
+const value2 = thisIsAnIdentifier as thisIsAReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyLongInterface;
+const value3 = thisIsAReallyLongIdentifier as (SomeInterface | SomeOtherInterface);
+const value4 = thisIsAReallyLongIdentifier as { prop1: string, prop2: number, prop3: number }[];
+const value5 = thisIsAReallyReallyReallyReallyReallyReallyReallyReallyReallyLongIdentifier as [string, number];
+
+const iter1 = createIterator(this.controller, child, this.tag as SyncFunctionComponent);
+const iter2 = createIterator(self.controller, child, self.tag as SyncFunctionComponent);
 
 =====================================output=====================================
 const name = (description as DescriptionObject).name || (description as string);
@@ -43,8 +54,11 @@ this.isTabActionBar((e.target || e.srcElement) as HTMLElement);
   ? wrappedError(errMsg, originalError)
   : Error(errMsg)) as InjectionError;
 "current" in (props.pagination as Object);
+("current" in props.pagination) as Object;
 start + (yearSelectTotal as number);
+(start + yearSelectTotal) as number;
 scrollTop > (visibilityHeight as number);
+(scrollTop > visibilityHeight) as number;
 export default class Column<T> extends (RcTable.Column as React.ComponentClass<
   ColumnProps<T>,
   ColumnProps<T>,
@@ -73,6 +87,104 @@ const state = JSON.stringify({
 (bValue as boolean) ? 0 : -1;
 <boolean>bValue ? 0 : -1;
 
+const value1 = thisIsAReallyReallyReallyReallyReallyLongIdentifier as SomeInterface;
+const value2 = thisIsAnIdentifier as thisIsAReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyLongInterface;
+const value3 = thisIsAReallyLongIdentifier as
+  | SomeInterface
+  | SomeOtherInterface;
+const value4 = thisIsAReallyLongIdentifier as {
+  prop1: string;
+  prop2: number;
+  prop3: number;
+}[];
+const value5 = thisIsAReallyReallyReallyReallyReallyReallyReallyReallyReallyLongIdentifier as [
+  string,
+  number
+];
+
+const iter1 = createIterator(
+  this.controller,
+  child,
+  this.tag as SyncFunctionComponent
+);
+const iter2 = createIterator(
+  self.controller,
+  child,
+  self.tag as SyncFunctionComponent
+);
+
+================================================================================
+`;
+
+exports[`assignment.ts 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+export const LOG_LEVEL = {
+    EMERGENCY: 0,
+    ALERT: 1,
+    CRITICAL: 2,
+    ERROR: 3,
+    WARNING: 4,
+    NOTICE: 5,
+    INFO: 6,
+    DEBUG: 7,
+} as const;
+
+const TYPE_MAP = {
+    'character device': 'special',
+    'character special file': 'special',
+    directory: 'directory',
+    'regular file': 'file',
+    socket: 'socket',
+    'symbolic link': 'link',
+} as Foo;
+
+this.previewPlayerHandle = (setInterval(async () => {
+  if (this.previewIsPlaying) {
+    await this.fetchNextPreviews();
+    this.currentPreviewIndex++;
+  }
+}, this.refreshDelay) as unknown) as number;
+
+this.intervalID = (setInterval(() => {
+  self.step();
+}, 30) as unknown) as number;
+
+=====================================output=====================================
+export const LOG_LEVEL = {
+  EMERGENCY: 0,
+  ALERT: 1,
+  CRITICAL: 2,
+  ERROR: 3,
+  WARNING: 4,
+  NOTICE: 5,
+  INFO: 6,
+  DEBUG: 7,
+} as const;
+
+const TYPE_MAP = {
+  "character device": "special",
+  "character special file": "special",
+  directory: "directory",
+  "regular file": "file",
+  socket: "socket",
+  "symbolic link": "link",
+} as Foo;
+
+this.previewPlayerHandle = (setInterval(async () => {
+  if (this.previewIsPlaying) {
+    await this.fetchNextPreviews();
+    this.currentPreviewIndex++;
+  }
+}, this.refreshDelay) as unknown) as number;
+
+this.intervalID = (setInterval(() => {
+  self.step();
+}, 30) as unknown) as number;
+
 ================================================================================
 `;
 
@@ -89,3 +201,27 @@ export default (function log() {} as typeof console.log);
 
 ================================================================================
 `;
+
+exports[`return.ts 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+function foo() {
+  return {
+    foo: 1,
+    bar: 2,
+  } as Foo;
+}
+
+=====================================output=====================================
+function foo() {
+  return {
+    foo: 1,
+    bar: 2,
+  } as Foo;
+}
+
+================================================================================
+`;
diff --git a/tests/typescript_as/as.js b/tests/typescript_as/as.js
deleted file mode 100644
index 596bdd8d2c92..000000000000
--- a/tests/typescript_as/as.js
+++ /dev/null
@@ -1,29 +0,0 @@
-const name = (description as DescriptionObject).name || (description as string);
-this.isTabActionBar((e.target || e.srcElement) as HTMLElement);
-(originalError ? wrappedError(errMsg, originalError) : Error(errMsg)) as InjectionError;
-'current' in (props.pagination as Object)
-start + (yearSelectTotal as number)
-scrollTop > (visibilityHeight as number)
-export default class Column<T> extends (RcTable.Column as React.ComponentClass<ColumnProps<T>,ColumnProps<T>,ColumnProps<T>,ColumnProps<T>>) {}
-export const MobxTypedForm = class extends (Form as { new (): any }) {}
-export abstract class MobxTypedForm1 extends (Form as { new (): any }) {}
-({}) as {};
-function*g() {
-  const test = (yield 'foo') as number;
-}
-async function g1() {
-  const test = (await 'foo') as number;
-}
-({}) as X;
-() => ({}) as X;
-const state = JSON.stringify({
-  next: window.location.href,
-  nonce,
-} as State);
-
-(foo.bar as Baz) = [bar];
-(foo.bar as any)++;
-
-(bValue as boolean) ? 0 : -1;
-<boolean>bValue ? 0 : -1;
-
diff --git a/tests/typescript_as/as.ts b/tests/typescript_as/as.ts
new file mode 100644
index 000000000000..cfdaced54745
--- /dev/null
+++ b/tests/typescript_as/as.ts
@@ -0,0 +1,40 @@
+const name = (description as DescriptionObject).name || (description as string);
+this.isTabActionBar((e.target || e.srcElement) as HTMLElement);
+(originalError ? wrappedError(errMsg, originalError) : Error(errMsg)) as InjectionError;
+'current' in (props.pagination as Object);
+('current' in props.pagination) as Object;
+start + (yearSelectTotal as number);
+(start + yearSelectTotal) as number;
+scrollTop > (visibilityHeight as number);
+(scrollTop > visibilityHeight) as number;
+export default class Column<T> extends (RcTable.Column as React.ComponentClass<ColumnProps<T>,ColumnProps<T>,ColumnProps<T>,ColumnProps<T>>) {}
+export const MobxTypedForm = class extends (Form as { new (): any }) {}
+export abstract class MobxTypedForm1 extends (Form as { new (): any }) {}
+({}) as {};
+function*g() {
+  const test = (yield 'foo') as number;
+}
+async function g1() {
+  const test = (await 'foo') as number;
+}
+({}) as X;
+() => ({}) as X;
+const state = JSON.stringify({
+  next: window.location.href,
+  nonce,
+} as State);
+
+(foo.bar as Baz) = [bar];
+(foo.bar as any)++;
+
+(bValue as boolean) ? 0 : -1;
+<boolean>bValue ? 0 : -1;
+
+const value1 = thisIsAReallyReallyReallyReallyReallyLongIdentifier as SomeInterface;
+const value2 = thisIsAnIdentifier as thisIsAReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyReallyLongInterface;
+const value3 = thisIsAReallyLongIdentifier as (SomeInterface | SomeOtherInterface);
+const value4 = thisIsAReallyLongIdentifier as { prop1: string, prop2: number, prop3: number }[];
+const value5 = thisIsAReallyReallyReallyReallyReallyReallyReallyReallyReallyLongIdentifier as [string, number];
+
+const iter1 = createIterator(this.controller, child, this.tag as SyncFunctionComponent);
+const iter2 = createIterator(self.controller, child, self.tag as SyncFunctionComponent);
diff --git a/tests/typescript_as/assignment.ts b/tests/typescript_as/assignment.ts
new file mode 100644
index 000000000000..8d0fb62077cd
--- /dev/null
+++ b/tests/typescript_as/assignment.ts
@@ -0,0 +1,30 @@
+export const LOG_LEVEL = {
+    EMERGENCY: 0,
+    ALERT: 1,
+    CRITICAL: 2,
+    ERROR: 3,
+    WARNING: 4,
+    NOTICE: 5,
+    INFO: 6,
+    DEBUG: 7,
+} as const;
+
+const TYPE_MAP = {
+    'character device': 'special',
+    'character special file': 'special',
+    directory: 'directory',
+    'regular file': 'file',
+    socket: 'socket',
+    'symbolic link': 'link',
+} as Foo;
+
+this.previewPlayerHandle = (setInterval(async () => {
+  if (this.previewIsPlaying) {
+    await this.fetchNextPreviews();
+    this.currentPreviewIndex++;
+  }
+}, this.refreshDelay) as unknown) as number;
+
+this.intervalID = (setInterval(() => {
+  self.step();
+}, 30) as unknown) as number;
diff --git a/tests/typescript_as/return.ts b/tests/typescript_as/return.ts
new file mode 100644
index 000000000000..97baa447576f
--- /dev/null
+++ b/tests/typescript_as/return.ts
@@ -0,0 +1,6 @@
+function foo() {
+  return {
+    foo: 1,
+    bar: 2,
+  } as Foo;
+}